diff --git a/drivers/isdn/hardware/mISDN/hfcpci.c b/drivers/isdn/hardware/mISDN/hfcpci.c
index 3261de1..f44adc6 100644
--- a/drivers/isdn/hardware/mISDN/hfcpci.c
+++ b/drivers/isdn/hardware/mISDN/hfcpci.c
@@ -90,6 +90,7 @@ enum {
 	HFC_DIGI_DF_M_A,
 	HFC_ABOCOM_2BD1,
 	HFC_SITECOM_DC105V2,
+	HFC_X_TENSIONS_XC_520,
 };

 struct hfcPCI_hw {
@@ -2182,6 +2183,7 @@ static const struct _hfc_map hfc_map[] =
 	{HFC_DIGI_DF_M_A, 0,
 	    "Digi International DataFire Micro V (North America)"},
 	{HFC_SITECOM_DC105V2, 0, "Sitecom Connectivity DC-105 ISDN TA"},
+	{HFC_X_TENSIONS_XC_520, 0, "X-Tensions XC-520 PCI ISDN"},
 	{},
 };

@@ -2233,6 +2235,8 @@ static struct pci_device_id hfc_ids[] =
 		(unsigned long) &hfc_map[21] },
 	{ PCI_VDEVICE(SITECOM, PCI_DEVICE_ID_SITECOM_DC105V2),
 		(unsigned long) &hfc_map[22] },
+	{ PCI_VDEVICE(XTENSIONS, PCI_DEVICE_ID_XTENSIONS_XC520),
+		(unsigned long) &hfc_map[23] },
 	{},
 };

diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index ae96bbe..0abac43 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -2173,6 +2173,9 @@
 #define PCI_VENDOR_ID_ZOLTRIX		0x15b0
 #define PCI_DEVICE_ID_ZOLTRIX_2BD0	0x2bd0

+#define PCI_VENDOR_ID_XTENSIONS		0x1ae7
+#define PCI_DEVICE_ID_XTENSIONS_XC520	0x0520
+
 #define PCI_VENDOR_ID_MELLANOX		0x15b3
 #define PCI_DEVICE_ID_MELLANOX_TAVOR	0x5a44
 #define PCI_DEVICE_ID_MELLANOX_TAVOR_BRIDGE	0x5a46